alt Hacker News> But none of them predicted my Covid infection days in advance. Oura did.
It actually warned you, or retrospectively looking at the metrics you could see that there was a pattern in advance of symptoms? (If the latter, same here with my Garmin watch - precipitous HRV decline in the 7 days before symptoms. But no actual warning.)
It actually told me, they've been doing this for a while: https://ouraring.com/blog/early-covid-symptoms/
Of course it didn't tell me "you have COVID19-B variant C" - but it did tell me I'm probably sick and should seek care.